The Overwatch League could have a draft system and a players' union

Overwatch League commissioner Nate Nanzer has discussed player treatment and expansion plans in a new interview with dotesports. 

Here's your thorough breakdown of the Overwatch League.

On implementing a draft system - an exciting pre-season feature of many traditional sports in which teams pick players - Nanzer says the main obstacle is anti-trust law, because a draft essentially forces a player to play for a team. "At such time when we have a players' union with collective bargaining, then we would totally explore doing a draft," he says.

from
https://www.pcgamesn.com/overwatch/overwatch-league-players-union-draft-code-of-conduct